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Loans and Allowance for Credit Losses - Troubled Debt Restructuring is 90 Days or More Past Due (Detail) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 USD ($) Contract | Sep. 30, 2019 USD ($) Contract | Sep. 30, 2020 USD ($) Contract | Sep. 30, 2019 USD ($) Contract
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | Contract | 3 | 2 | 4 | 3
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | $ | $ 190 | $ 49 | $ 240 | $ 70
Residential real estate [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | Contract | 0 | 2 | 1 | 3
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | $ | $ 0 | $ 49 | $ 50 | $ 70
Loans to individuals [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | Contract | 2 | 0 | 2 | 0
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | $ | $ 78 | $ 0 | $ 78 | $ 0
Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | Contract | 1 | 0 | 1 | 0
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | $ | $ 112 | $ 0 | $ 112 | $ 0

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- Definition Number of financing receivable contracts modified as troubled debt restructuring within previous 12 months, with subsequent payment default. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953682-111524 + Details
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- Definition Amount of financing receivable modified as troubled debt restructuring within previous 12 months, with subsequent payment default. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953682-111524 + Details
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